Moodle Cross Site Scripting (XSS)

published 2021-06-16 5 y ago modified 2026-09-08 2 mo ago also BIT-moodle-2021-32244 , EUVD-2022-3894 , GHSA-g5m5-j48g-fr24

cvss: 5.4; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.9%; EPSS 0.9% chance of exploitation in 30 days, percentile 59%
public exploits: 0; none known

Cross Site Scripting (XSS) in Moodle 3.10.3 allows remote attackers to execute arbitrary web script or HTML via the "Description" field.

Patch / fix

fixed in 1

bitnami moodle 3.10.4

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-32244 updated 2025-11-21 cvss 6.1

moodle: allows remote attackers to execute arbitrary web script or HTML via Description field

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.90% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/langkexiansheng/Images/blob/master/moodle_xss.gif referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
GitHub	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
NVD	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	3.5	AV:N/AC:M/Au:S/C:N/I:P/A:N
OSV	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
packagist	moodle/moodle	1 listed version	no fix listed
bitnami	moodle	>=3.10.3, <3.10.4	3.10.4

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /langkexiansheng/Images/blob/master/moodle_xss.gif
web, exploit, third-party-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2021-32244
advisory, web
github.com /moodle/moodle
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary